Bleeder fitting for brake cylinders



Sept 23, l941- C. R. CARLIN 2,256,516

BLEEDER FITTING FOR BRAKE CYLINDERS Filed June l1, 1940 Patented sept. 23, 1941 UNITED STATES PATENT OFFICE BLEEDER'FITTING FOR BRAKE CYLINDERS Charles Robert Carlin, Brunswick, Ga.

Application June 1l, 1940, Serial No. 339,939

1 Claim.

This invention relates to the class of hydraulic brakes for motor vehicles and pertains particularly to improvements in fittings for facilitating the bleeding of air from the brake line.

The present invention has for its primary object to provide an improved swivel type of bleeder fitting for connection with a vehicle hydraulic brake cylinder to vfacilitate the bleeding of air therefrom as the' cylinder and brake system are being lled with fluid, the present tting being designed particularly to enable the operator to tightly connect the tting with the brake cylinder and at the same time adjust the air outlet in the most advantageous position for the extension of a bleed hose therefrom into a iiuid receiving receptacle.

Another more specific object of the invention is to provide a bleed tting for the purpose described wherein the outlet nipple for the fitting,

with which ableeder hose is connected, is swivelly coupled'with the iitting so as to facilitate its ready rotation into any desired position after the tting has been. secured tightly in the bleed aperture in the wall of the fluid brake cylinder.

The invention will be best understood from a consideration of the following detailed description taken in connection with the accompanying drawing forming part of this speciiication, with the understanding, however, that the invention is not to be confined to any strict conformity with the showing of the drawing but may be changed or modified so long as such changes or modifications mark no material departure from the salient features of the invention as expressed in the appened claim.

In the drawing:

Fig. 1 is ,a view illustrating in side elevation the device embodying the present invention, showing the same applied.

Fig. 2 is a vertical sectional view through the fitting.

Fig. 3 is a horizontal section on the line 3-3 of Fig. 2.

In the drawing, the numeral I designates fa portion of a vehicle hydraulic brake or fluid brake cylinder which has the usual wall aperture 2 which constitutes the air bleeding opening for the cylinder and which is closed during the operation of the brake system by a removable plug (not shown) i The swivel airbleed fitting embodying the present invention is indicated as a whole by the numeral 3 and comprises a main body 4 which is preferably in the form of a disk having a ing 'axially from one side thereof a nipple 5 which is exteriorly threaded and which is designed for threaded engagement in the bleed,

opening 2.

Upon the opposite side of the body 4 from the nipple 5, there extends axially with respect to the body, the relatively long stem 6 which at its inner end is encircled by the surrounding shoulder l. A chamber 8 is formed from the outer end of the stem 6 inwardly to substantially the plane of the shoulder 1 where it merges with the tube or small bore 9, forming a seat for a ball check I0. The inner end of the chamber 8 communicates with lateralports II which open across the chamber l. Upon the seat i0 is a ball check I2 which closes the inner end of the bore 9 and serves to prevent air or yother fluid from passing into the bore 9 from the adjacent chamber or from the ports II.

The stem 6 is exteriorly threaded, as indicated at I3, and is designed to have threadably engaged upon its outer end a threaded nut I4, which is knurled around its outer f and which upon its inner face 1s nrcvided. with the lannular shoulder i which 1s ci the same overall diameter as the shoulder Disposed against the inner face of 'the body II and encircling the shoulder 'I is a washer i6 and a similar washer il is disposed against the inner 30 face of the nut l in encircling relation-with the shoulder I5.

Encircling the stem and the two shoulders 'I and I5 is a cylinder I8, the ends of which are engaged by the washers IB-i'l and the cylinder 35 may be secured against rotation around the stem by threading the nut It inwardly so as to grip the cylinder between the nut 'and body and the washers as illustrated.

The interior diameter of the cylinder i8 is 40 slightly greater than the overall diameter of the shoulders l-I5, so that the shoulders engage within the ends of the cylinder and there is thus formed between the shoulders and the inner wall of the cylinder, the annular fluid area I9.

'I'his area is in communication with the ports II. The cylinder I8 has a corrugated hose tube or nozzle 20 connected therewith which opens through the wall thereof to the interior for communication with the chamber I9. A rubber or other exible tube 2| is joined to the nozzle 20 to receive uid which may escape from the cylinder .through the bore 9 and past the ball check I2. The ball check I2 is normally pressed onto its seat by the expansion spring 22 which is posiknurled peripheral surface and having extendtioned within the chamber 8 of the stem and means for the nut Il.

which is held in place and under tension by the cap nut 23. In addition to holding the spring 22 in place. this cap nut functions as a lockin yThe numeral 2l designates an adapter body into which .the nipple 5` may be threaded and which has a passage extending therethrough and through an exteriorly threaded nipple 25 whichis' of different diameter.- from thenipple vI. This adapter 24 may be employed forconnecting the nipple `5 with an -outlet or air bleed aperture oi a cylinder where such aperture is not of the-right size to directly receive the niDDle'B. f Inthe employment of the present bleeder-tting.-'the--operatoi-removes1the air bleed plug in the break'wheei cylinderv andiscrews into the -apertl'1re'2 the nipple l or 'the nipple-.2520i ythe I9, during the operation of the vehicle brake actuating pedal for the Purpose ot forcing fluid from the master cylinder into the lines and into the brake cylinders.

What is claimed is:

An air bleeder iitting, comprising a circular body,v a nipple extending axially from one side i of the body, a stem extending axially from the other side of the body. the nipple being threaded for engagement -in the air bleed aperture of a brake cylinder, the nipple having a bore extending longitudinally therethrough from its -fend beyond the body and into the stem, a circular shoulder encircling the stem upon the top of the body between the latter and said port. a nut threaded upon said stemand'having a circular adapter` 26 after-securing the nipple i to theadapter. :Assuming that the nipple l5 is threaded directly vintov the air bleed aperture. theopera- .tor may then screw up .the fitting -until the body t is brought tightly into position againstthe cylinder. By loosening the nut 23, the knurled nut Il may be backed oil slightly to give turning clearance for the part or cylinder I8 andthe nut 23 may then be tightenedup to hold thev shoulder of the samediameter as' the first shoul,

denfandrin opposed relationtherewith, a washer encircling, ,geen or sani shoulders; f a. .chamber formed through 'thestem' and communicating with `said'bore, a lateral portithroush. the wall knurled nut I I in this position. This allows the nipple to have swivel movement while maintaining a tight or leak-proof connection withthe opposed members I and i4 and with the shoulders 'l and I5, and permits the nipple to be positioned to extend in any direction desired for the extension of the hose to a suitable receptacle. After positioning the `hose as desired, the operator may extend its free end into a suitable jar for the purpose of catching any waste duid which' may escape past the ball check I2, by way of the bore 9 and the `ports Il into the chamber of said stem communicating with said' chamber-g.

a check rvalve in the inner end ol the chamber closing communication between the port and the 

